Electric drill.



.R. A. NORLING.

ELECTRIC DRILL. APPLICATIQN FILED SEPT. 18. 1913. v 151538,543. Patented Nov. 2, 1915.

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R. A. NORLING.

ELECTRIC DRILL.v APPLICATION FILED SEPT. I8. 1912/.

1 1 58,543. Patented Nov. 2, 1915.

3 SHEETS-SHEET Z.

1l/lll l IIII il! IIIIIII I R. A. NORLING.

ELECTRIC DRILL. APPLICATION FILED SEPT. I8. |913. L I

Patented Nov. 2, 1915.

3 SHEETS-SHEET 3.

iiNirn STATES PATENT ornion.

REINHOLD A. `NORLING, or AURORA, ILLINOIS, 4AssIeNORV To AURORA AUTOMATIC MACHINERY COMPANY, or AURORA, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRIC DRILL.

Specification of Letters Patent.

'To all whom t may concern:

Be it known that I, REINHOLD A. NOR- LING, .a citizen of the United States, yanda resident of Aurora', in the county of Kane I and State of illinois, have invented certain new and useful Improvements .in Electric Drills; and do hereby declare that the following is a full, clear, and eXact'description Y thereof, reference being had to the accom'- panying drawings, and to the lettersof reference marked thereon, which form a part-Y of this specification. Y

This invention relates to improvements in electrically operated tools and moiefparticw larly to that class of electrically operated tools embracing drills and implements of like nature of a portable character.y

The object of this .invention is toprovide a construction for .tools of thecharacter de' scribed, which embraces, 'among .other things, such featuresns high1eficiency,.eX-`

vtreine durability and exceptional; power Vin proportion to its size and weight. TO-accomplish this end, I propose'to unite. a suitable motor of rugged construction, provided with an adequate and suitable fan designed to prevent overheating'of.ithemotor 'parts under'the'mostiextreme conditions of opera-l tion, and a spindle or tool holding member provided with- Aample and. coinpactlyf arranged bearings.

My inventionvwill, therefore, consist in;

the matters hereinafter described and more particularly pointed out in the' appended claims. y y," In the drawings, Figure lisa view in longitudinal section of an electric drill embodyking my invention, Fig. 2is an enlarged cross-sectional view taken on `line v2 2-of Fig.V 1, Fig. 3 is a view in cross-section taken on line 3-3 of Fig. 1, Fig'. 4fis a'view in cross-section taken on line 4^-4of Fig. 1, Fig. 5 is an enlarged view in end elevation with' an outwardly eXtending,

accompanying dra-wings, lthe tool constituting my invention comprises the several main parts as follows: A cylindric casing 1, containing the motor field coils, armature, brushes, brush'holders, and Ventilating fan; a gear casing 2 supporting the tool spindle 3 and containing certain gears interposed between the motor armature shaft and the said tool spindle; a` center plate or partition wall 4 between said motor casing 1 and gear casing 2 supporting suitable bearings for the gears, spindle, and armature shaft, and a handle 5 rigidly secured, by preference, to the motor casing 1, vand containing .a manually operable switch 6, and other suitable electrical connections. vThe motor casing 1, center plate 4 and gear casing 3 are secured together by means of a plurality -Of cap Patented Nov. 2, i915.

and gear cases, respectively, and through the edges of the center plate.

Referring more in'v detail to the construction of my device, the motor casing 1 is cylindrical in shape and preferably constructed of aluminum or similar light metal. Within the central portion of the motor casing is supported 'the fieldmagnet 8, the. same being held securely in place byvmeansof longitudinal ribs 1b formed on the' inner surface of the Vcasing 1, land a clamp screw '8a extending through the lower part of the casing adjacent'to Vthe handle 5. Extending longitudinally in .the motor; casing is the armature Vcomprising an armature shaft 9 upon which is mounted the armature core 10 and cominutator 10a. The said armature shaft 9 is rotatably mountedv within the motor casingin the following manner: The

rear portion of the saidcasing is provided bridge member 11 integral with said casing and forming on either side comparatively large Openings communicating with the interior of the casing. lithin the central portion of said bridge member is Vformed an annular depression into which is fitted the outer `antifriction bearing- 12for the armature shaft. This bearing comprises two concentrically. arranged collars or cage memvertical` bers 12 and 12". The inner collar 12 is preferably pressed upon the reduced extremity of the armature shaft 9 and secured in positionv by means of a washer 13 and nut 13, the latter having screw-threaded engagement with the extremity of the said shaft 9. The outer collar 12b is loosely fitted within the depression formed within the bridge member in order to permit the desired end play of the armature shaft. Within the adjacent surfaces of the collars 12 and 12b are formed concentric grooves which form a bearing race for a plurality of antifriction bearing balls 14. rlhe inner eX- tremity of the shaft 9 is provided with a partially threaded tapered portion 9, upon which is mounted a small pinion 15 having a diameter which is by preference' substantially equal to that of the shaft so that in reality the same may form a continuation of the shaft having gear teeth cut on the end portion thereof. The pinion 16 eX- tends through an aperture at in the center plate and projects beyond the same into the gear casing 2. An anti-friction bearing 17 supports the adjacent end of the shaft and is retained within a depression formed in the center plate l and within the margin of the said aperture lb. This bearing is similar in construction to the bearing 11 hereinbefore described, and for that reason the same need not be again described iii detail: Furthermore, in view of the fact that I have used this type of anti-friction bearing` in the construction of several parts of the device, the same in each case will lienceforth be merely referred to as antifriction bearings, and a detail description ofthe same being omitted for the reason' before indicated. immediately adjacent to the outer extremity of the armature shaft 9 and constituting a part of the armature is the before mentioned commutatoi 10. lVithin the space surrounding the commutator are contained the brushes and component parts as follows: A brush plate 18, (Fig.A 2) composed of fiber or like suitable insulating material, is mounted within and concentrically with the casing adjacent to its outer end. The said brush plate 18 has the form of a ring through which extends the said commutator 1G, said brush plate being provided with a plurality of elongated curved slots 18, 18, through which extends screws 19, 19. The said screws have screw-threaded engagement with the lugs 20,- 20 integral with and located at the outer endsof tivo of the longitudinal ribs 1b upon the inner surface of the motor casing 1. Mounted upon the brush plate 18 are the brush holders 21, 21. These are secured in place upon the brush plate bv means of screws 22, 221. The brush holders 21, 21, are shown as parallel and vertically ar ranged plates provided at their central portions and adjacent to the colnmutator with retaining slots 21, 21, within which are held the contact brushes 23, 23 extending inwardly substantially at right angles to the brush holders and engaging the surface of the commutator. Staples 23, 23, are further provided to hold said brushes withinthe retaining slots. The said screws 22, 22, at the corresponding extremities of the brush holders also act as terminals for the electrical connections leading to the brushes. Pivotally mounted upon the brush plate above and below each of the brush holders are brush arms 241, 2-1, which are pivotally secured at a short distance from the face of the brush plate by means of the said screws 22b before mentioned as extending through the oppositely disposed ends of the brush holders. rlhese brush arms bear upon the outer ends of the brushes, a constant pressure being applied thereto by means of coil springs 21, 21, (Fig. 1) surrounding the screws 22h and secured at their ends to the said brush holders and brush arms. The entire brush mechanism can be shifted by loosening the screws 19, 19, and rotating the brush plate 18 so as to vary the brush lead when desired.

Surrounding the entire end portion of the motor casing and including the bridge niember 11, is a cup-shaped cap or brush cover 25 (Figs. 5 and 6) of sheet metal. The marin of said cover 25 abuts against a shoulder formed upon the motor casing 1 by an annular flange 1c upon the outer surface thereof, and is secured in position in the following manner: Immediately above and below the central portion of the bridge member 11 are studs 27 and 27, which have screwthreaded engagement with the said bridge member; These Studs extend through apertures in the brush cover, one of said studs 27 being of considerable length and adapted to carry a feed handle 28 which screws upon the stud tightly against the cover. The other 'stud 271 is provided with a nut 29 also fitting against the cover. The central portion of the brush cover is pressed outwardly to form a depression 25 adapted to accommodate the extremity of the armature shaft 9 and nut 13. The portion of the brush cover adjacent to the depression 25 bears against the collar 12a of the antifriction bearing and acts to hold the said collar in place. A suitable cover 25b is provided upon the portion of the brush cover forming the said depression and normally covers an oil hole extending through the brush cover. The brush cover is further provided with a plurality of small holes 26 for the purpose of admitting air to the interior of the motor casing 1.

At the inner end of the interior space of the motor casing is a fan 29, the same comprising a plurality of comparatively short fan blades 29a, which move in an annular space in close proximity to the center plate and the wall of the motorcasing.` The hub 291 of the fan is mounted upon the armature shaft by means of a pin 3() extending through the said hub andshaft.y Within the wall ofthe vmotor casing is formed Yan annular channel 31 which surrounds the periphery of the fan. Communicating with the` channel 31, and extending through the casing 1 are a plurality of annularly arranged holes 31:L approximately surrounding the fan. The purpose of these holes is toform a means of egress for air-which is drawn through the motor casing by the fan, thevair entering the holes 26 of the brush cover andV passing through the motor casing by means of the spaces formed between the ield coilsand the wall ofthe casing. c

The current of air induced by the fan carries away the heat generated by the motor, thusrpreventing the overheating of the same. Y

Referring now to the construction and arrangement of the gearing and spindle contained within and supported by the gear casing and centerplate: A 'tool spindle 3 is provided .which consists of a .hollow shaft having its axis parallel to, thefaxis jof the i armature shaft and offset therefrom.y The said tool spindle is pro-vided at its'inner end with an enlarged cylindricportion having tained within a ,cage 34h.

the formA of an annular flange 3, which surrounds a centrally disposed annular cayity. Encircling and in concentric relation to this -flange 3a is an internal spindle gear 33,v the same preferably comprising a cup-shaped gear member l 32, opening toward the center plate and formed integral with the; spindle at avpoint adjacent tothe inner portion-V of the liange 3a.. Within a ldepression formed upon the inner surface of the. gear member is retained a gear ring inl which are cut the gear teeth of the internalgear The drill spindle 3.is rotatably mounted -within the gear vcasing by means of bearings arranged inthe following manner: Within the outer portion of the cavity formed by the annular collar 3a is located-a rollerbearing 34, comprising a pluralityof cylindric rollers 34a xloosely re cylindric bearing .guide36 .which is in the form of a stub-shaft one end of which projects a short distance into the cavity of tool spindle vand the opposite end of which is Y The s aid roller' bearing is interposed between and bearsV supported -bywmeans of a`boss 37 yintegral with the center plate 4, which bosshasa v cent-ral bore into which the last mentioned end portion of said guide extends. `The guide 36 isgfurther provided with an 4annular-flange or collar. 36'"L bearing against kthe face of the boss'37 and which acts as a groove within which are retained a plural-r ity of bearing balls 39. The balls are interposed between the ball race 38 and a circular thrust plate 40 loosely mounted within the cavity, and which plate abuts againsttheend face of the guide 36. By this construction the thrust bearing-acts to transmit the endv` thrust of the tool spindle to the guide 36 and, in so doing, diminishes the friction resulting from the endwise force exerted by the spindle during the operation of the drill or other tool carried in the spindle. The tool spindle is further provided with an external roller bearing 41 surrounding the same at substantially its central portion and between the annular flanged portion 3iL of the spindle and the'end portion of the wall of lthe casing 2. rlhis rollervbearing is of the. usual construction comprising Vrollers 42 surrounding the shaft and bearing against bushings 43 and 44 Vsecured'to the spindle andwithin an annular recess formed. in the wall of the casing 2, respectively, and roller thrust plates or rings 45, 45, against which the ends of the rollers abut and which kare interposed between fthe ends of said/rollers and the shoulder 3b ofthe spindle; andthe end wall of thecasing2. The tool spindle projects through an aperture Vformed in the end in througn which the tool spindle extends. vWithin a bore formed at the innerend of said stufling box is retained` a packing ring 47 providedfor the purpose of preventing the escape .of lubricating oil from the interior of the said casing 2. A central bore or lsocket extends thro-ugh the outer portion of the spindle and communicates with .the

cavity at its innerv end.. The said jsoclret is of a uniform diameter' and isprovldedat its inner end with aplurality of longitudinally extending" and diametrical'ly arranged inwardly projecting ribs or projections 3c (Fig. 4). This central bore or socket is adapted to hold the drill' chuck 48, within the jaws 4S of which is tightly held the drill. or similar tool. The chuck 4S is provided with a chuck shank 49 having a cylin drical forward portion of uniform diameter adapted to fit snugly within the said socket of the drill spindle. The shank termi-nates a short distance from the ball race 3S of the thrust bearing, and is provided at its extremity with longitudinal grooves 49 adapted to admit and engage the ribs 3 of the tool spindle, thereby serving to prevent the rotation of said shank within the drill spindle. In order to reta-in the drill chuck in its socket, the following'means are provided: Upon the outer end of the drill spindle is mounted a. locking nut 50 having screw-tl'ireaded engagement with the threaded extremity of the said spindle. The shank of the drill chuck is provided with an annular flange 49b against which the lock-nut bears, thusv by tightening the lock nut upon the said flange the chuck 4S is held in place. The flange 491 also acts to limit the distance which the shank of the drill chuck may enter the drill spindle socket.

Extending at right angles to the longitudinal axis of the motor casing, is a hollow cylindric extension 1c integral with said motor casing. The said extension is provided with a circular marginal flange to which is rigidly secured the before mentioned tool handle 5, the same also extending at right angles to the axis of the motor casing. The handle comprises a tubular member having two cup-shaped extremities and a smaller intermediate central portion serving as a grip for the hand of the operator. At the upper extremity of the handle is provided a flange 5 registering with the flange of the extension l1 of the motor casing and through which extend cap screws 5l, 5l by means of which the said handle is 'secured to the motor casing. lVithin the handle and adjacent portion of the extension 11 are contained the switch G and connections. ril`he said switch is preferably constructed as follows: Two stationary terminal disks or blocks 52 and 53, Fig; of the extension 1d of the motor casing and in the adjacent 'cup-shaped extremity of the handle 5, respectively. These terminal blocks are composed of insulated material, such as porcelain or hard rubber or other suitable material and are separated by a movable contact disk 54 of like material and which is pivoted in position by means of a center' pin 55 extending through the same and pivotally mountedv within sockets formed in the stationary terminal blocks 52 7, are secured in the lower portion and 53:, said Contact disk being separated slightly from said terminal blocks by means of' fiber faces 56. lVi'thin each of' the terminal blocks' are embedded two terminals 57, the same being similarly arranged diametrically as well' as longitudinally. These terminal-s comprise parts as follows: A terminal socket 5S extends through the terminal block and opens toward' the center disk 54.` llVithin the socket is a terminal plunger 59 provided with a rounded cont-act point and an interior recess in which is retained a coiled' spring G0 acting tov constantly force the plunger from its socket. A terminal screw 6l connects the conductor wires G2 to the terminals 5T. The center disk 54 is provided with Contact blocks 54 composed of a conductive meta-l and extending through the same so located as 'to engage the correspending pairs of terminals in one position of the contact disk. TheV said contact disk is further provided with radial lugs or operating fingers 541 which project through slots 5b, Fig. 2, formed in the upper margin of the handle and beyond the same. The lugs are of sufficient length so that the same may be conveniently engaged by the thumb or finger of the operator and rotated through a distance sufficient to make or break the electrical connection between the terminals.

l/Vithin the lower cup-shaped portion of the handle is an electrical connection block or socket 63 connected with the terminals 57 of the terminal block 53 of the switch by means of the conductors 62. The said connection block 63 is adapted to receive a suitable connecting coupling or plug or any desired or ordinary type attached to a sullicient length of wire whereby electric current may be suppliedto operate the device.

By the construction of an electric drill as herein described and illustrated, several advantageous results are obtained, chiefly among which may be mentioned the ease and convenience with which the parts may be reached yand removed when it is desired to renew or replace broken or worn parts; the compact manner in which the rotating parts are mounted, and the novel and efficient manner of providing bearings for the said rotating parts, portability and ellicieney in operation.

It is to be noted that in the arrangement of the motor, the brushes and brush holders, which ordinarily require frequent attention, are located so that they are not only protected but easily accessible by merely removing the brush cover 25, which operation does not require the necessity of disturbing any other part or parts of the device. The brush cover 25 further acts to protect the brushes and other parts from injury and prevents the entrance of dirt into the motor casing, and at the same time motor casing is amply provided with holes to admit air therein.

' armature shaft or disturbing the motor in any way, in case the pinion shouldbe broken. Nor would the fan be disturbed by this oper-y ation, for the reason that the same is con` nectedwith the armature shaft and not to theipinion. Y

Another advantage 'of particular importance is the form of bearings used in connection lwith they internal gear and the drill spindle, consisting of the stationary vguide 36 secured to the center plate, and the antifriction bearings mounted upon them. This construction not only permits 'the external gear and drill spindle to have avery desir-v able long, adequate, well-braced andfw'ellbalanced' bearing adapted to minimize-*the loss of power by friction thereby enabling the maximum degreev of eiiiciency or power to be obtained,"b'utmake's it possible to locate the bearingentirely within theV gear and spindle, the result being that a very light and compact arrangement is obtained, whereby the size of the gear/casing is maa terially reduced, and the extra weight'ofv bearings llikewise reduced to a minimum. The manner of securing the chuck within the drill spindle'socket has'also its advantages over the ordinary tapered socket and taper tting chuck or tool, for it is to* be observed that the shank of the chuck fits snugly and in accuratelycentered position within the socket and can be set orfremoved entirely without the use of tools, by merely removing the lock nut with the ngers.

i It is impossible for the chuck to stick in the' drill socket as is often the case in a tapered socket and shank which condition requires the use of a tool and necessitates a loss of time. The constructiton of the handle and the location of the switch and electrical connections''are further features to be mentioned. VThe switch is entirely inclosed within the handle and motorV casing thereby being fully protected from breakage, and

is in such'a position that the operating fin# 5o gers are easilyfac'cessible by the hand of the operator` grasping the tool. Again, by mounting a Asocket at the outer` end of the handle andproviding a conductor extending to the switch, the tool has a complete and protected controlling switch and attachments, thus dispensing with the necessity of having an undesirable length ofl wire connected withthe tool which musty be trans-A ported, or as is moreoften the case, dragged overV the Hoor when moving the tool from of my invention and for' that reason I do not wish to be limited to the specific construction herein described and illustratedy in the accompanying drawings, except in so far as itisfspecifically pointed out in the appendedclaims. i

I claim kas my invention:

` .1. In an electric drill, 'the combination of a motor casing provided at one end with yafbridge"-rnembeiy a motor mounted in said `motor casing and provided wlth an armature shaft, an antifriction bearing for said armatureshaft mounted in a depression formed in said bridge member, and a perforated cover extending over the end of the motor casing and engaging said antifriction bearing. Y Y A '2. In an electric drill, the combination of amotor casing provided at one end with a bridge member, a motor mounted in said motor casing, and provided with an arma-v ture shaft having at one end, an antifriction bearing mounted in a depression formed in said bridge member, va perforated covery extending over the end of the motor casing and engaging said bearing, a stud extending through said cover and anchored in said bridge member, and a feed handle'carried by said stud.

` 3. In an'r electric drill, the combination of a motor casingprovided at one end with a bridge member, a motor mounted in said casing and provided with an armature shaft,

y a tool vspindle operatively connected with said armature shaft, antifriction bearings for said armaturexshaft mounted in a depression' Aformed in' the bridge member, a perforatedcover extending over the end of the motor casing and said depression, a stud extending through said cover and anchored insaid bridge member, and a feed handle carried by said studandbearing against said cover.

4. In an electric drill, ythe combination of a motorcasing, provided at one end with a bridge member, a gear casing at the other end, a center plate interposed between" saidr motor casing and said gear casing, a motor mounted in said motor casing and provided with an armatureshaft, contact brushes Vsupported in said motor casingadjacent to said bridge member, a fan secured to said armature shaft adjacent to said center plate, said casing being provided with exhaust aperA turesadjacentto said fan, antifriction bearings for said armature vshaftmounted in said bridge member and center plate, and a perforatedcover extending over the end of the motor casing and secured to said bridge member. A' j 45. In anY electric drill, the combination of a casing provided atone end with aibridge member, an electric motor mounted in said casing and provided with an armature'shaft, a'bearing for said armature shaft comprising an inner member secured to said shatt, an outer member loosely retained in an annular vdepression of said bridge member `and a plurality of bearing balls interposed beg tween said members, anda perforated cover extending over the end of the motorvcasing and secured to said bridge member. and bearing against the outer bearing member to hold the same in place. o

6. In an electric drill, the Vcombination of a casing open `at one end and provided with a bridge member integral with the casing, a motor in lsaid casing, a tool spindle .jou-rnaled in Said casi-ng and operatively connected with said motor, anti-friction bearings for the armature shaft of said motor. mounted in saidbridge member, a perforated cover extending over the said open end ofhsaid casing and exterior to said bridge member and provided Withfa .central depression the margin -`oi, Whichgbearsu against the said bearing studs; extending through said cover. andl anchored in said 'bridge member, and a feed handle 4carried by oney of s aid stride in axial alinement with the too'l spindle.

7. In an electric. drill, the combination of acasing open at oneend and proyided with a bridge member integral therewith .and-extending over said open end, an electric'mo.- tor Withinsaid casing, .a geareasing mounted at the other .end of said motor casing, a center plate separating said motor. andgear` casings, a toolspi-ndle.journaled insa-'id gear.

casing operatively connected with the, motor, a'spindlebearingguide supportedin said centerpl-ate, an-tirictior-iP bearing members for the armatureshaft in said center plate andsaid'bridge member, and a perforated cover extending over .the open `end of. said. motor casing and seeured tosaid bridge member, said .coyer bearing against onefof the armature Shaft bearing membereto hold the same in said bridge member.

8. In an electric drill, the combination of a motor-,casing open one endl provided. with a bridge member integral with the mo.- tor casing, agear casing -at the other end, a tool. spindle journaled in said gear, casing and operatively connected with said motor, a center plate separating said motor and. gear casings,A an .electric motor mountedv in Said gearl casing, antifriction bearingsffor the armature shaft of said motorin said cen,- ter plate and bridge member, a. perforated cover extending over the said open' end of said motor and exteriorto saidbridgemem.- ber,`studs .extending through said cover4 and anchored in, `said lbridge member, vand a flee'd handle carried` by one of said Studs in axial ali'nement with the tool spindle. y

9. In anelectric drill, the combination of a casing,` a motor. mounted in Saidcaeing, a tool spindle. journaled inv said :casing in ope'ratiyel connection with said motor, and a hollow non-rotative'handle rigidly mounted upon and; communicating with said casing and extending at right angles to tthe axis oit said tool spindle, and a switch mounted in the adjacent portions of said casingv and handle, al socket member mounted in the outelend portion of the handlel and conduc` ilgors,y connecting said switch and socket mem- .10. In an electric drill, the combination of a casing, a motor mounted in said casing, a toolspindle journaled in Said Casi-ng in operative connection with Said motor, a feed lla-Edle mounted upon said' casing in axial alinement with saidA tool spindle., and a tubular non-frotatiyeL handle rigidly secured to, and extending from, eapid casing at right angles `to :the axis of the tool handle, Said handle communicating 4with said casng and provided with a slot `adjacent to` said casing, a switch mounted. within Sad handle Provided with operating finger extending outwardly'through said slo't [and a socket member mounted n the outer extremity 0f said hanllofancl in electroal; ooonooton. With, said switch. Y

11. In an electric drill, the` A,combination of a cas-inglproyided withV an extension projecting. trein said casing atright angles to the axis thereof, said .extension being vprovided with an opening Communicating with Said' oasiiig, tool Spindle mounted-51.1 Seid @eineA ood; operatively oo noootool .with Said motor, a hollow non-rotative switch handle rigidly connected with lsaid .cylindric exten-v Siooolid oommuniootirle with the Casing, o switch mounted in `said handle vand adjacent portion of Ysaid extension, and a socket mounted inftheouter end otsaid handle and oleotloolly ooorlootod with Seid Switch.

12, In `an electric drill, the combination .of oosloe, Peoridod: at ooo @ed with o bridge member, a motor in'said casing, a ,tool Spindle jlournaied infysaigdA casing and in op'- eratiue connection with s aid motor, a perforated coyer extending oyer. the, end of the casing and seeured to saidbridge member, a feed handle secured in said bridge member, a non-rotative hollow handle'` mounted on said casing, at rightangles` ito', the axis ofthe tool "Spindle, a .manually operable SVitCll` mounted., in said. handle yadjacent Vto the cas-v ingo and-"a `socket mounted inthe outereni ot'said handle in electrical connection with said."S.W.itch.`l '13.,- 'In anelectricfdrill, .the combination, of a motorucas'i-ngf provided at oneend with a briidge member, a .perforated cover extending oyen the end of the fmtorcasing, al motor infaifd motor casing, a gearcasingmounted. at .one endv of'Said motor Casin a lcenter plate separating said motor gear casings, a tool spindle. jglnirnaled in Saifd, gear casing` and inoperative connection with said motor, ab eairingr guide for said tool spindle supported in 7said center plate, a ffeedhandle los - monnted on the bdgememloer'o said motor as my invention I axfm'y ksignature n tlle casing in aXal alnement with said teol` .presence of two Witnesses, this 4thfday of Yl0 l' Y I spindle, a non-rotative switchl handle se- September A..D. 1913.' Vcuredto said motoreasng and extending at n right angles to the axis of said toolspindle, *NORLNG Y and a manually opeable switch mounted in Wtnessesz n sald swltch handle. Y l Y Y Y C. S. MOONEY, .v

l In test1mony,'th'at Iclalm the foregolng M. JrBURKEL. v 1

Copies of this patent` may be obtained for five cents each, by addressing the VConi'znissioner of VPatents.

l A A Washington, I). C. 

